Secondary Invite

Minutes after my first interview of this cycle, I received a secondary invite from ACOM (Dothan, Al). Idk if it's my imposter syndrome, but I think that this late in the cycle there is no way they haven't either already filled their class or have plenty of interviewees to choose from. For reference, I submitted an application for ACOM back in September. Should I suck it up and submit the secondary cause there's nothing to lose (except $50)? Or do y'all agree that sending me a secondary in mid-March is just a money grab for them?